Variability of Solar and Stellar Activity by Two Interacting Hydromagnetic Dynamos
We propose a combination of two dynamos for solar and stellar magnetic activity. A strong-field dynamo operating in the overshoot layer at the base of the convection zone generating superequipartition fields concentrated in isolated flux tubes is responsible for cyclic activity (e.g., sunspots), while a turbulent weak-field dynamo in the convection
Schmitt, D. et al.
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1998